A substrate for a catalytic converter, comprising an open cell carbon foam having a geometric surface area of at least about 5000 m.sup.2/m.sup.3 and a permeability of at least about 8.0 darcys.

A slurry composition for a catalyst and a method for producing the same, a catalyst and a method for producing the same using the slurry composition for a catalyst. The method omits many heretofore required treatment steps and reduces catalyst production cost. The method comprising the steps of providing a slurry composition for a catalyst, comprising at least an aluminosilicate, Cu, and water, and having a solid concentration of 0.1% by mass to 90% by mass, wherein a component for a catalyst has composition represented by Al.sub.2O.sub.3.Math.xSiO.sub.2.Math.yT.sub.2O.Math.zCuO (wherein T is a quaternary ammonium cation, and x, y and z are numbers that satisfy 10x40, 0.1y<2.0, and 0.1z<2.0, respectively) in terms of molar ratio based on an oxide; coating at least one side of a support with this slurry composition; and heat-treating at 350 C. or higher.

A substrate for a catalytic converter, comprising an open cell carbon foam having a geometric surface area of at least about 5000 m.sup.2/m.sup.3 and a permeability of at least about 8.0 darcys.

A substrate for a catalytic converter, comprising an open cell carbon foam having a geometric surface area of at least about 5000 m.sup.2/m.sup.3 and a permeability of at least about 8.0 darcys.

A substrate for a catalytic converter, comprising an open cell carbon foam having a geometric surface area of at least about 5000 m.sup.2/m.sup.3 and a permeability of at least about 8.0 darcys.

Described is a new multilevel article comprising a multitude of ducts and, in each duct in the direction of flow, at least one area which generates turbulence, forms an open duct section, is connected to the duct wall, and forms a baffle for the incoming flow and a stall strip for the outgoing flow. The described article has a plurality of successive interconnected duct structures which form a step-like transition in relation to each other in the direct of flow.

An aftertreatment component for use in an exhaust aftertreatment system. The aftertreatment component comprises an aftertreatment substrate and a compressible material. The compressible material may be formed from a plastic thermoset, a rubberized material, or a metal foil which permits for the selective expansion of the substrate within the compressible material, while also reducing cost and manufacturing complexity. In various embodiments, the aftertreatment substrate and the compressible materials may be formed separately and coupled to each other, or they may be formed concurrently via coextrusion.

An aftertreatment component for use in an exhaust aftertreatment system. The aftertreatment component comprises an aftertreatment substrate and a compressible material. The compressible material may be formed from a plastic thermoset, a rubberized material, or a metal foil which permits for the selective expansion of the substrate within the compressible material, while also reducing cost and manufacturing complexity. In various embodiments, the aftertreatment substrate and the compressible materials may be formed separately and coupled to each other, or they may be formed concurrently via coextrusion.

A honeycomb structure prevents catalyst slurry from leaching out when applying a wash coat for making a catalyst supported, ensuring air permeability of the outer portion and in which there is no occurrence of cracking when used as a gasoline particulate filter. The honeycomb structure having: a honeycomb substrate composed of porous partition walls forming a plurality of cells and a porous outer portion; and a resin composition on the outer portion of the honeycomb substrate, wherein the outer portion and the partition walls of the honeycomb substrate are formed of the same material; a porosity of the honeycomb structure is 50% or more; and the resin composition is impregnated into pores of the whole outer portion; and the impregnation depth is equal to the outer portion thickness or a part of the resin composition is impregnated deeper than the outer portion and reaches the cell partition walls.

A slurry composition for a catalyst and a method for producing the same, a catalyst and a method for producing the same using the slurry composition for a catalyst. The method omits many heretofore required treatment steps and reduces catalyst production cost. The method comprising the steps of providing a slurry composition for a catalyst, comprising at least an aluminosilicate, Cu, and water, and having a solid concentration of 0.1% by mass to 90% by mass, wherein a component for a catalyst has composition represented by Al.sub.2O.sub.3.xSiO.sub.2.yT.sub.2O.zCuO (wherein T is a quaternary ammonium cation, and x, y and z are numbers that satisfy 10x40, 0.1y<2.0, and 0.1z<2.0, respectively) in terms of molar ratio based on an oxide; coating at least one side of a support with this slurry composition; and heat-treating at 350 C. or higher.